Core.



WILLIAM MAYO VENABLE, OF PITTSBURGH, PENNSYLVANIA, ASSIGNOR TO BLAW STEEL CONSTRUCTION COMPANY, OF PITTSBURGH, PENNSYLVANIA, A CORPORA- TION OF NEW JERSEY.

CORE.

Specification of Letters Patent.

Patented Sept. 12, 1916.

Application tiled-July 8, 1913. Serial No. 777,861.

T0 all `whom t may concern Be it known that I, WILLIAM MAYO VEN- ABLE, a citizen of the United States, residing at Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Cores, of which the following is a specification.

The invention relates to cores for use in the formation of hollow articles of concrete or the like such as tile, pipe, hollow walls and other hollow parts. The invention has for its primary objects: the provision of a core of simple, light construction which can be very easily collapsed and which is maintained in rigid expanded position by an improved form of stifl'ener. Certain embodiments of the invention are illustrated in preferred form in the accompanying drawings, wherein- Figure 1 is an end view of the core in eX- panded position; Fig. 2 is a section through the concrete in which the core is used with the core shown in side elevation therein; Fig. 3 is an end elevation of the structure of Fig. 2, the core being shown in collapsed position; Figs. 4 and 5 are plan and partial side elevation views respectively of a modified form of construction; and Figs. 6 and 7 are plan and partial side elevation views respectively of still another modification.

The core, as shown in Figs. 1, 2 and 3, consists of two sheet metal plates 1 and 2 overlapping at their edges and normally assuming the position shown in Fig. 3 when the stiffeners-to be laterl describedare removed. In the particular core indicated in Fig. 2, three stiffeners, 3, 4, and 5, are employed, such stiffeners being elliptical sheet metal plates removably supported in position inside the members 1 and 2 and serving to hold such members in the expanded position indicated in Figure 1.

The means for supporting the plates 3, 4 and 5 removably in position are substantially the same for each plate, and a. description for one will be sufficient for all. Referring to the upper plate 3, it will be seen by reference to Figs. 1 and 2 that such plate is supported at its middle by means of a pair of rivets 6 and 7 secured to the shell or plate 1 and projecting inwardly a short distance. The end of the stiliener plate 3 lits between a pair of inwardly projecting rivets 8 and 9 also secured to the plate 1 (Fig. 2).

'Ihese rivets 8 and 9 prevent the -plate 3 from swinging about the rivets G and 7. It will be noted that all of the supports or rivets are carried by the plate 1 so that all the stiifeners 3, 4 and' can be positioned in one half of the core before the other half of the core is positioned. This renders the assembling of the parts convenient and easy.

In order to remove the core after the concrete has set above it, it is necessary to remove the plates 3, 4 and 5, and permit the shells 1 and 2 to collapse to the position indicated in Figure 3. To facilitate the removal of the plates 3, 4 and 5, the chain 10 is employed secured to all of the plates 3, 4 and 5. A certain amount of slack is provided in this chain between each of the successive plates so that the plates are removed successively by pulling up on the chain.

After the stiifener plates have been removed,

the shells or plates 1 and 2 normally collapse to the position indicated in Fig. 3, after which they may be easily removed endwise from the core.

The structure illustrated in Figs. 4 and 5 is similar to that heretofore described with the exception that the shape of the plates of shells 1 and 2 is modified and the shells do not spring in and collapse themselves when the stifl'ener plates 3 are removed. A pair of rivets 8 and 9 are provided on the plate 1 at the end of the stiffener, while rivets 6 and 7 are provided upon the plate 1 at the sides of the stiffener for supporting the stiener adjacent its central portion. The chain 10 serves to remove the stii'eners.

In the construction of Figs. 6 and 7 four plates, 12, 13, 14 and 15, are employed, overlapping as indicated in Fig. G, and carrying the rivets for supporting the stiffener plate 20, the rivet 16 being carried by the plate 12, the rivet 1S by the plate 13, and the rivet 19 by the plate 15. Opposite the rivet 16 is another supporting rivet 17 (Fig. 7), the edge of the stiifened plate 20 lying between such rivets. The chain 102 serves to remove the stiffeners. The number of plates and their shape might be modified in a large number of ways to suit various requirements. As indicated in Fig. 7 and also in Fig. 5, a wire may be secured around the mold if desired to assist in holding the plates in position.

What I claim is:

1. In combination, a core of sheet metal contractible inwardly and formed of sepalOO rate substantially similar sheet metal sections adapted to Vit one inside the other when the core is in knockedv down condition, supporting lugs on the interior of one of the sections of the core for maintaining a stiiener plate in position, and a removable stiener resting removably upon the said supporting means and maintaining the core in expanded position.

2. In combination, a core of sheet metal contractible inwardly and formed so that the core springs inward and normally assumes a contracted position when not supported against contraction, stop means upon the interior of the core, and a removable stifi'ener adapted to rest upon the said stop means with its edges yieldingly gripped by the core and maintain the core in expanded position, the said core being formed of separate substantially similar sheet metal sec-v tions adapted to fitv one inside the other when the core is in knocked down condition.

` 3. In combination, a vertical core of sheet metal contractible inwardly, a seriesofsets of stop means spaced along the interior of the core, aseries of removable brace plates resting upon the upper sides of the stop means and maintaining the core in expanded position, and flexible connections between the plates whereby they may be removed endwise of the core. l

4. In combination, a core of sheet metal contractible inwardly, a series of sets of stop means arranged inside the core, a series of brace plates resting upon the stop means and maintaining the core in expanded position and removable endwise of the core, and lost motion connections between the brace plates..

5. In combination, a core comprising a pair of sheet metal shells overlapping at their edges, a plurality of stop means carried by one of the sheets and arranged to entirely support a brace plate, and a removable brace plate resting upon the stop means and maintaining the core in expanded position with the shells yieldingly gripping the edges of the plate.

6. In combination, a core comprising a pair of sheet metal shells overlapping at their edges, stop means carried by one ot the sheets, and a removable plate resting upon the stop means and maintaining the core in expanded position, the said stop means comprising a pair of adjacent lugs between which the edge of the plate lits and another pair of lugs on opposite sides of the shell and beneath the plate.

In testimony whereof I have hereunto signed my name in the presence of the two subscribed witnesses.

WM. MAYO VENABLE.

L. A. MYERS.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents. Washington, D. C. 

